<template>
  <div class="login-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      title="登录"
    >
      <van-icon
        slot="left"
        name="cross"
        @click="$router.back()"
      />
    </van-nav-bar>
    <!-- 导航栏结束 -->

    <!-- 登录表单 -->
    <!-- 表单验证:
    给 van-field 组件配置 rules 验证规则
    1.当表单提交的时候会自动触发表单验证
    如果验证通过,会触发submit事件;失败则不会触发
     -->
    <van-form
      ref="loginForm"
      @submit="onSubmit"
    >
      <van-field
        v-model="user.mobile"
        name="mobile"
        placeholder="请输入手机号"
        :rules="userFormRules.mobile"
        type="number"
        maxlength="11"
      >
        <i
          slot="left-icon"
          class="toutiao toutiao-shouji"
        ></i>
      </van-field>
      <van-field
        v-model="user.code"
        name="code"
        placeholder="请输入验证码"
        :rules="userFormRules.code"
        type="number"
        maxlength="6"
      >
        <i
          slot="left-icon"
          class="toutiao toutiao-yanzhengma"
        ></i>
        <template #button>
          <!-- time:倒计时时间 -->
          <van-count-down
            v-if="isCountDownShow"
            :time="1000 * 60"
            format="ss s"
            @finish="isCountDownShow=false"
          />
          <van-button
            v-else
            round
            native-type="button"
            size="small"
            class="send-sms-btn"
            type="default"
            @click="onSendSms"
          >发送验证码</van-button>
        </template>
      </van-field>
      <div class="login-btn-wrap">
        <van-button
          class="login-btn"
          block
          type="info"
          native-type="submit"
        >
          登录
        </van-button>
      </div>
    </van-form>
    <!-- 登录表单结束 -->
  </div>
</template>

<script>
import { login, sendSms } from '@/api/user'
export default {
  name: 'LoginIndex',
  data () {
    return {
      user: {
        mobile: '', // 手机号
        code: ''// 验证码
      },
      userFormRules: {
        mobile: [{
          required: true,
          message: '手机号不能为空'
        },
        {
          pattern: /^1[3|5|7|8|9]\d{9}$/,
          message: '手机号格式错误'
        }],
        code: [{
          required: true,
          message: '验证码不能为空'
        },
        {
          pattern: /^\d{6}$/,
          message: '验证码格式错误'
        }
        ]
      },
      isCountDownShow: false // 是否展示倒计时
    }
  },

  components: {},

  computed: {},

  mounted () { },

  methods: {
    async onSubmit () {
      // 1.获取表单数据
      const user = this.user
      // 2.表单验证
      // 在组件中必须通过this$toast来调用Toast组件
      this.$toast.loading({
        message: '登录中...',
        forbidClick: true, // 禁用背景点击
        duration: 0 // 持续时间,默认2000,如果为0则一直展示
      })
      // 3.提交表单请求登录
      try {
        const { data } = await login(user)
        this.$store.commit('setUser', data.data)
        this.$toast.success('登录成功')
        // 登录成功跳转回原来的页面
        // back方式不严谨,后面功能优化再说
        this.$router.back()
      } catch (err) {
        if (err.response.status === 400) {
          this.$toast.fail('手机号或验证码错误')
        } else {
          this.$toast.fail('手机号或验证码错误')
        }
      }
      // 4.根据请求响应结果处理后续操作
    },
    async onSendSms () {
      // 1.校验手机号
      try {
        await this.$refs.loginForm.validate('mobile')
      } catch (err) {
        return console.log('验证失败', err)
      }
      // 2.验证通过,显示倒计时
      this.isCountDownShow = true
      // 3.请求发送验证码
      try {
        await sendSms(this.user.mobile)
        this.$toast('发送成功')
      } catch (err) {
        // 发送失败,关闭倒计时
        this.isCountDownShow = false
        if (err.response.status === 429) {
          this.$toast('发送频繁,请一分钟后重试')
        } else {
          this.$toast('发送失败,请一分钟后重试')
        }
      }
    }
  }
}

</script>
<style lang='less' scoped>
.login-container {
  .toutiao {
    font-size: 37px;
  }
  .send-sms-btn {
    width: 152px;
    height: 46px;
    line-height: 46px;
    background-color: #ededed;
    font-size: 22px;
    color: #666;
    // 清除按钮默认的内外边距
    padding: 0;
  }
  .login-btn-wrap {
    padding: 53px 33px;
  }
  .login-btn {
    background-color: #6db4fb;
    border: none;
  }
}
</style>
